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On a Bank boat I sailed with a second mate who had a vernier sextant. It had a small magnifying glass to make it easier to pick out the coinciding engraved graduations.
As I recall he had bought it whilst an apprentice with E-Ds, which would have been around 17 years before as he was 34 at that time. From Perth, he was the spitting image of James Robertson Justice. (Which has absolutely nothing to do with it).
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